Dip pipe for processing containers



Dec. 26, 1950 s. w. MocANN DP PIPE FOR PROCESSING CONTAINERS Filed Nov. 25, 1949 lll ` INVENTOR. Sich/lead W. MfComn Patented Dec. 26, 1950 DIP PIPE vFR PROCESSING CONTAINERS Sidney W. McCann, Irondequot, N. Y., assignor to-The Pfaudler Co., Rochester, N. Y., a corporation of New York ApplicationNovember 25, 1949, Serial No. 129,240

6 Claims. (Cl. 13S- 47) This invention reates to dip pipes of thevariety adapted for supplying materials such as gases,`

liquids, solids or the like to a processing container at a point adjacent the bottom or below the top surface of the contents of the container, or for withdrawing a portion of its contents below its top surface, as well understood in the art. Such dip pipes are frequently employed in connection with the processing of acid and alkaline materials of a highly corrosive nature and it hasI been a prior practice to make the dip pipe fromV a tubular steel pipe protected against corrosion by covering its walls, inside and out, with-afusedv enamel or glass coating such as commonly appliedj to the inner surfaces of processing containers of the character described. It has been found, however, that where such glass coating extends over the sharply curved corners between the outer and inner walls at the dipping end of the pipe, there is a tendency for the ycoating to become damaged by contacts with other surfaces, or to become weakened by the sharp curvatures and cracked or pitted, with resulting exposure andv corrosion of the metal pipe and contamination of the processed materials.

One object of the invention, therefore, is to provide an improved dip pipe having a more durable and practical type of construction.

Another object, more specifically stated, is vto provide a glass coated dip pipeA of the nature indicated with simple, practical and efficient meansv for protecting its coated dipping end against injury of either type and resultingcorlv rosion of the metal pipe.

To these and other ends the invention resides in certain improvements and combinations of parts, all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawings:

Fig. lis a sectionalelevation," partly broken away, of a processing -container having applied thereto a dip pipe embodying the present inven'.- tion and shown in vertical elevation;

Fig. 2 is an enlarged, sectional elevation of the dip pipe, partly broken away, and

Fig. 3 is an enlarged, fragmentary, sectional elevation of a portion of the lower end of the dip pipe shown in Fig. 2, to better illustrate its structural details.

The preferred embodiment of the invention, herein disclosed by way of illustration, is adapted for use with a processing container or tank, indicated generally at I0 (Fig. 1), having side walls II. a lower end or head I? and an upper head I3, the latter being formed with the usual` nozzle I4 terminating in a anged end I5 forv the attachment of outlet connections. The sides and bottom of the container are enclosed by a"l spaced jacket Iii for applying heating or coolingf media, as well understood in the art. The inner surfaces of such a container empoyed :in processi ing corrosive substances, are commonly covered;

and protected by a fused glass coating (not shown) extending over the inner walls and the top surface of its ange I5, as well understood in the art.

such a nozzle with its dipping end extending to the lower portion of the container for supplyingor withdrawing materials as described.

The present embodiment of the invention comprises, preferably, a straight pipe I'I of cold drawn, seamless steel tubing and of a diameter and lengthsuitable to the partcular application. A pipe of this material .has the advantages of economy and strength but is subject, of course, to attack by corrosive substances such as the acid or alkaline materials commonly employed in industrial processes.

commonly appled to the processing containers such as the tank II. It

has been found in practice, however, that where such glass coating passes around the sharply Curved corners, as IS, between the outer and inner walls at the dipping extremity of the pipe,

the coating is subject to chipping and injury by contact with other surfaces, as well as to weakening of the coating in fusing itaround the sharply curved extremity of the pipe with a resulting tendency to become cracked and pitted, thus exposing the metal pipe to `spreading corrosive'. attacks which injurethe pipe and contaminate` the materials being processed. It-has been found' that these weaknesses of such dip pipes may be overcome by the improved construction which will now be described.

In applying the present invention, the outer surface of the pipe is ground away to reduce its outer diameter over a portion 20 extending upwardly from the end of the pipe by a distance of, say, 1% inches, the diameter being reduced by an amount of, say, 11g of an inch, sufficient to compensate for the combined thickness of a layer of cement and a protective metal sleeve hereafter described. Such reduction in diameter is accomplished prior to the application of the n The present invention is hereinv disclosed in a form adapted for insertion through.

Consequently, it has beenv the practice'to protect the pipe by fusing overv its inner and outer walls a continuous enamel. or glass coating I8 of the nature referred to as inner surfacesjof;

glass coating I8 so that the glass coating extends continuously over such reduced surface, as shown in Fig. 3.

A layer of corrosion-resisting cement 2|, such as the known resin or silicate cement, is applied over the glass coating around the end and adjacent portions of the inner and outer side Walls Iof the pipe extending to the same height as the area of reduced diameter described above. This cement layer serves as a protection for the glass coating and also for attaching a protective metal ferrule 22, which will now be described.

The ferrule 22 is preferably made by drawing a thin sheet of corrosion-resisting metal, such as tantalum, having a thickness, for example, of 1/64 of an inch, into the form of spaced, concentric, inner and outer sleeves, 23 and 24, respectively, extending continuously around the end of the pipe and up the inner and outer side Walls as.

high as the cemented reduced portion of the pipe described above and as shown in the drawings. This double wall ferrule is adhesively secured to the glass coated surfaces of the pipe by the cement layer 2| described above, which seals the space between the ferrule and glass coating and further protects the latter. As shown, the described reduction in the outer diameter of the pipe compensates for the addition of the comibined thicknesses of the outer cement layer and the` outer ferrule sleeve 24 so that the overall di,- ameter of these parts is no greater than the outer diameter of the glass coated pipe above the ferrule, thus preventing any interference with the insertion of the pipe through gasket or other means for sealing its upper end to a container nozzle.

By such means the dipping end of the pipe and its glass coating are eiicently shielded and protected against impacts or abrasions tending to injure the coating, as well as against the penetration of corrosive substances into any cracks or pits which may develop in the coating at the end of the pipe. The ferrule 22 thus provides metallic protection for the enamel or glass coating which, in turn, protects the steel pipe I1. The ferrule is adapted to be economically manufactured and cemented to the reduced coated end of the pipe and provides it with durable and effective protection against injuries such as described, over long periods of use.

The opposite 4or upper end of the pipe is preferably equipped with a welded-on attaching ilange 25 formed with bolt openings 26 by means of Which the pipe may be secured to the flange I5 of the tank nozzle I4, as by bolting it to the. 1.

have been referred to in the above description of one preferred embodiment of the invention, it will be readily apparent to those skilled in the art that such materials, dimensions, proportions and details of construction are capable of wide variation to suit the conditions of particular adaptations to which the invention may be applied.

It will thus be seen that the invention accomplishes its objects and While it has been herein disclosed by reference to the details of a preferred embodiment, it is to be understood that such disclosure is intended in an illustrative, rather than a limiting sense, as it is contemplated that various modifications in the construction and arrangement of the parts will readily occur to those skilled in the art, within the spirit of the invention and the scope of the appended claims.

I claim:

l. A dip pipe for supplying materials to and withdrawing the same from a container below the upper surface of the contents thereof comprising a metal pipe, a corrosion-resisting glass coating covering the inner and outer surfaces of said pipe and a ferrule of corrosion-resisting metal covering said coating at the dipping end and over the adjacent side wall portions of said coated pipe to shield and protect the same.

2. A dip pipe as speced in claim 1 in which said ferrule is adhesively secured and sealed to said pipe coating by an interposed layer of corrosion-resisting cement.

3` A dip pipe as speciiied in claim 1 in which said ferrule comprises a thin sheet of corrosionresisting metal formed into spaced, concentric, inner and outer sleeves extending continuously around the dipping end of said pipe and over said adjacent side Wall portions to shield and protect the same.

4. A dip pipe as speeied in claim 3 in which said ferrule sleeves are adhesively secured and sealed to said pipe coating by an interposed layer of corrosion-resisting cement.

5. A dip. pipe as specified in claim 4 in which said metal pipe has its dipping end reduced in outside diameter by an amount substantially equal to the thickness of said cement layer and sleeve to maintain a substantially uniform overall diameter for said dip pipe.

6. A dip pipe as specied in claim 4 in which the outer end of said dip pipe is provided with a flange for attaching the same to the nozzle of a container and with a flanged end for connection with an outlet conduit.

SIDNEY W. MCCANN.

REFERENCES CITED The following references are of record in the iile of this patent:

UNITED STATES PATENTS Number Name Date 1,634,183 Gervais et al June 28, 1927 1,678,540 Trenner July 24, 1928 

